Improvement in devices for moving blind-slats



LOUIS GATHMANN, OF CHICAGO, ILLINOIS.

IMPROVEMENT IN DEVICES FOR MOVING BLIND-SLATS.

Specification forming part of Letters Patent No. 122,595, dated January9, 1872.

SPECIFICATION. To all whom it may concern:

' Beitknownthat I, Louis GATHMANN, of Cnt cago, in the county of Cookand State of Illinois, have invented certain Improvements in Device forMoving the Slats in Blinds, of which the following is a specification,reference being had to the accompanying drawing.

My invention consists in a novel arrangement of mechanical deviceswhereby the slats of a window-blind may be adjusted and fastened by aperson inside of the room Without opening the Window.

Figure l represents a perspective vieW of a Window-frame and blindhaving my improvements applied. Fig. 2 is a viewr of the operatingdevices detached, and Fig. 3 is avertieal section of the Window-frameand blind, showing my devices in position.

In the drawing, A represents an outside Window-blind, having its slatspivoted and connected to each other by a vertical bar, a, in the usualmanner, and B represents a Windowframe to which the blind is hinged. Thejournal of one of the slats I make longer than the rest, and secure uponit a round socket, C, which is set Hush into the rear edge of the blind,as shown in Figs. l and 2, so that, by turning the socket, it Will moveall the slats. Around the journal of the slat, behind the j socket, Imake a recess, and place therein around the journal a spiral spring, d,which bears against the socket so as to prevent the slats from beingjarred or blown out of position when the blind is open 0r partially so.In the outer face of the socket C I form a square hole or recess, andinthe Window-frame I mount a short shaft, D, with a square protruding endwhich enters the socket when the blindis closed, as shown in Fig. 3. Onthe inner end of shaft D I mount a pinion, e, and in the Window-frame Imount a second shaft, E, at right angles to the rst, and provided on itsinner end With a Worm,f, which engages in the pinion c, as shown. Thefront end o f shaftE I extend out through the face of the Window-frameinto the room, and provide it with a knob or handle, G, on theprotruding end, as shown in Figs. l and 2.

When the blind is shut, and the end of the shaft D is entered in thesocket, as shown in Fig. 3, if the knob Cr be turned it will turn theWorm, and the latter will rotate the shaft D and turn the slats of theblind. The Worm holds the pinionso that the slats cannot, when the blindis closed, be turned or opened from the outside. When the blind isopened the spiral spring retains the slats in position, so that, whenthe blind is again closed, the socket will be in position for the end ofshaft D to enter it.

Having described my invention, What I claim The combination of thesocket C and the spring d onthe journal of the blind-slat with the shaftD and Worm f located in the Windowframe, all constructed and arrangedfor joint operation, substantially as described, whereby the slats ofthe blind can be adjusted, as set forth.

Witnesses: LOUIS GATHMANN.

N. B. HORNE, WM. H. Lorz. v (24.)

